Merge bitcoin-core#1582: cmake, test: Add secp256k1_ prefix to test names

87384f5 cmake, test: Add `secp256k1_` prefix to test names (Hennadii Stepanov)

Pull request description:

  This PR improves regex matching options when using `ctest` in downstream projects, such as Bitcoin Core.

  For instance, a downstream project users can filter their tests like that:
  ```
  ctest --tests-regex "secp256k1"
  ```
  or
  ```
  ctest --exclude-regex "secp256k1"
  ```

  A `ctest` log with this PR:
  ```
  $ ctest --test-dir build -j 16
  Internal ctest changing into directory: /home/hebasto/git/secp256k1/secp256k1/build
  Test project /home/hebasto/git/secp256k1/secp256k1/build
      Start 1: secp256k1_noverify_tests
      Start 2: secp256k1_tests
      Start 3: secp256k1_exhaustive_tests
      Start 4: secp256k1_ecdsa_example
      Start 5: secp256k1_ecdh_example
      Start 6: secp256k1_schnorr_example
      Start 7: secp256k1_ellswift_example
      Start 8: secp256k1_musig_example
  1/8 Test #4: secp256k1_ecdsa_example ..........   Passed    0.00 sec
  2/8 Test #5: secp256k1_ecdh_example ...........   Passed    0.00 sec
  3/8 Test #6: secp256k1_schnorr_example ........   Passed    0.00 sec
  4/8 Test #7: secp256k1_ellswift_example .......   Passed    0.00 sec
  5/8 Test #8: secp256k1_musig_example ..........   Passed    0.00 sec
  6/8 Test #3: secp256k1_exhaustive_tests .......   Passed    6.19 sec
  7/8 Test #1: secp256k1_noverify_tests .........   Passed   38.83 sec
  8/8 Test #2: secp256k1_tests ..................   Passed   91.66 sec

  100% tests passed, 0 tests failed out of 8

  Total Test time (real) =  91.67 sec
  ```

ACKs for top commit:
  theuni:
    utACK 87384f5
  real-or-random:
    utACK 87384f5

Tree-SHA512: d8e46558cf58c9c660544b7bdfed24c991eb3e120b6511aa3968f509190130e498749a3c4dbabc87a7f22f0aa0056c6bcd3fc6c44f5eb131588945d593546840

Author: real-or-random

examples/CMakeLists.txt

@@ -9,7 +9,7 @@ function(add_example name)
     $<$<PLATFORM_ID:Windows>:bcrypt>
   )
   set(test_name ${name}_example)
-  add_test(NAME ${test_name} COMMAND ${target_name})
+  add_test(NAME secp256k1_${test_name} COMMAND ${target_name})
 endfunction()
 
 add_example(ecdsa)

src/CMakeLists.txt

@@ -87,12 +87,12 @@ endif()
 if(SECP256K1_BUILD_TESTS)
   add_executable(noverify_tests tests.c)
   target_link_libraries(noverify_tests secp256k1_precomputed secp256k1_asm)
-  add_test(NAME noverify_tests COMMAND noverify_tests)
+  add_test(NAME secp256k1_noverify_tests COMMAND noverify_tests)
   if(NOT CMAKE_BUILD_TYPE STREQUAL "Coverage")
     add_executable(tests tests.c)
     target_compile_definitions(tests PRIVATE VERIFY)
     target_link_libraries(tests secp256k1_precomputed secp256k1_asm)
-    add_test(NAME tests COMMAND tests)
+    add_test(NAME secp256k1_tests COMMAND tests)
   endif()
 endif()
 
@@ -101,7 +101,7 @@ if(SECP256K1_BUILD_EXHAUSTIVE_TESTS)
   add_executable(exhaustive_tests tests_exhaustive.c)
   target_link_libraries(exhaustive_tests secp256k1_asm)
   target_compile_definitions(exhaustive_tests PRIVATE $<$<NOT:$<CONFIG:Coverage>>:VERIFY>)
-  add_test(NAME exhaustive_tests COMMAND exhaustive_tests)
+  add_test(NAME secp256k1_exhaustive_tests COMMAND exhaustive_tests)
 endif()
 
 if(SECP256K1_BUILD_CTIME_TESTS)